/Engine/Plugins/Developer/Concert/ConcertSync/ConcertSyncClient/Source/ConcertSyncClient/Public/IConcertClientPresenceManager.h
Set presence visibility of the specified client endpoint id
void SetPresenceVisibility ( const [FGuid](API\Runtime\Core\Misc\FGuid) & EndpointId, bool bVisibility, bool bPropagateToAll )